Approved modifications · supplemental type certificate · current · amended

SA02268CH (PAGE 6)

Installation of Airwolf Filter Corp. Air Oil Separator. Held by Airwolf Filter Corporation, which holds 61 approved modifications in all. Last revised June 4, 2020. System: other and general.

What it applies to

Kind of product: Aircraft
Design holder: The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; Gores William; Gores William; Gores William; Gores William; Gores William; Gores William; Gores William; Gores William; Gores William; Gores William; Gores William; Odom William P.; PZL Mielec; R. M. Lewis; R. M. Lewis; R. M. Lewis; R. M. Lewis; R. M. Lewis; Thrush Aircraft Inc.; Thrush Aircraft Inc.; Thrush Aircraft Inc.; Thrush Aircraft Inc.; Thrush Aircraft Inc.; Thrush Aircraft Inc.; Thrush Aircraft Inc.; Thrush Aircraft Inc.; Thrush Aircraft Inc.; Thrush Aircraft Inc.; Thrush Aircraft Inc.; Thrush Aircraft Inc.; True Flight Holdings LLC; True Flight Holdings LLC; True Flight Holdings LLC; True Flight Holdings LLC; True Flight Holdings LLC; True Flight Holdings LLC; True Flight Holdings LLC; Twin Commander Aircraft LLC; Twin Commander Aircraft LLC; Twin Commander Aircraft LLC; Twin Commander Aircraft LLC; Twin Commander Aircraft LLC; Twin Commander Aircraft LLC; Twin Commander Aircraft LLC; Twin Commander Aircraft LLC; Twin Commander Aircraft LLC; Twin Commander Aircraft LLC; Twin Commander Aircraft LLC; Twin Commander Aircraft LLC; Twin Commander Aircraft LLC; Twin Commander Aircraft LLC; Twin Commander Aircraft LLC; Twin Commander Aircraft LLC; Twin Commander Aircraft LLC; Univair Aircraft Corporation; Univair Aircraft Corporation; Univair Aircraft Corporation; Univair Aircraft Corporation; Univair Aircraft Corporation; Univair Aircraft Corporation; Univair Aircraft Corporation; Univair Aircraft Corporation; Univair Aircraft Corporation; Univair Aircraft Corporation; Univair Aircraft Corporation; Univair Aircraft Corporation; Univair Aircraft Corporation; Univair Aircraft Corporation; Utterback B.; Utterback B.; Utterback B.; Utterback B.; Vulcanair S.p.A.; Vulcanair S.p.A.; Vulcanair S.p.A.; Vulcanair S.p.A.; Vulcanair S.p.A.; Vulcanair S.p.A.; Vulcanair S.p.A.; WDL Luftschiffgesellschaft MBH; Weatherly Aircraft Company; Weatherly Aircraft Company; Weatherly Aircraft Company; Weatherly Aircraft Company; Weatherly Aircraft Company; Weatherly Aircraft Company; Weatherly Aircraft Company; Zlin Aircraft a.s.; Zlin Aircraft a.s.; Zlin Aircraft a.s.
Models: R4D-8, R4D-8Z, Super DC-3, DC-6A, Navy R6D-1, USAF C-118A, DC-6B, Navy R6D-1Z, AT-6 (SNJ-2), AT-6A (SNJ-3), AT-6B, AT-6C (SNJ-4), AT-6D (SNJ-5), AT-6F (SNJ-6), BC-1A, SNJ-7, T-6G, DC3-G102, DC3-G102A, DC3-G103A, DC3-G202A, DC3A-S1C3G, DC3A-S1CG, DC3A-S4C4G, DC3A-SC3G, DC3A-SCG, DC3C-R-1830-90C, DC3C-S1C3G, DC3C-S4C4G, DC3C-SC3G, DC3D-R-1830-90C, C54-DC, C54A-DC, C54B-DC, C54D-DC, C54E-DC, C54G-DC, DC-4, DC-6, 50-C, 65-C, 65-CA (Army L-3F), KCA, S-50-C, S-65-C, S-65-CA, 50-L, 50-LA, 65-LA, 65-LB (Army L-3G), C-87A (Army), PZL M20 03, PB2Y-3 (Navy), PB2Y-3R (Navy), PB2Y-5 (Navy), PB2Y-5R...
Type certificates: 6A2, 6A2, 6A2, 6A3, 6A3, 6A3, 6A4, 6A4, A-2-575, A-2-575, A-2-575, A-2-575, A-2-575, A-2-575, A-2-575, A-2-575, A-2-575, A-618, A-618, A-618, A-618, A-669, A-669, A-669, A-669, A-669, A-669, A-669, A-669, A-669, A-669, A-762, A-762, A-762, A-762, A-762, A-762, A-762, A-781, A-675, A-675, A-675, A-675, A-675, A-675, A-675, A-702, A-702, A-702, A-702, LTC-30, A68EU, LTC-5, LTC-5, LTC-5, LTC-5, LTC-5, 2A7, 2A7, 2A7, 2A9, A3SW, A3SW, A3SW, A3SW, A4SW, A4SW, A4SW, A4SW, A11EA, A11EA, A11EA, A11EA, A16EA, A16EA, A16EA, 2A4, 2A4, 2A4, 2A4, 2A4, 2A4, 2A4, 6A1, 6A1, 6A1, 6A1, 6A1, 6A1, 6A1, 6A1, 6A1, A12SW, A-718, A-718, A-767, A-767, A-767, A-767, A-767, A-787, A-787, A-787, A-787, A-787, A-787, A-787, LTC-17, LTC-17, LTC-17, LTC-17, A31EU, A31EU, A31EU, A31EU, A31EU, A31EU, A31EU, AS4EU, A10WE, A10WE, A10WE, A10WE, A26WE, A26WE, A26WE, A30EU, A76EU, A76EU
On this site: Aero Commander 680 51 registered
Aeronca S-65 6 registered
Ayres Corporation S-2 244 registered
Douglas C-54 7 registered
Douglas DC-3 155 registered
Moravan Z143 5 registered
Moravan Z242 19 registered
Moravan ZLIN 526 11 registered
North American AT-6 Texan 228 registered
Partenavia S.P.A. P 68 16 registered
Snow 600 7 registered
Vulcanair Spa P68 10 registered
The FAA's record: On the FAA's site

What an approved modification is

A supplemental type certificate is the FAA's approval of a change to a certified design: a new engine or propeller, avionics, an autopilot, floats, a parachute, a larger fuel tank, an ice-protection kit. The company holding it may sell the kit and the paperwork to owners of the listed models; the modification then becomes part of that aircraft's record. The FAA's list says what was approved and for which models, not how many aircraft carry it.

Source: FAA supplemental type certificates (Dynamic Regulatory System). Register counts from the FAA register of October 22, 2026.